Press for the manufacture of tubes, rods, and the like from blanks.



A. SUHWIEGER. PRESS FOR THE MANUFACTURE OF TUBES, RODS, AND THE LIKE FROM BLANKS.

APPLICATION FILED JUNE 27,1907.

Patented June 8, 1909.

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PRESS FOR THE MANUPAGTUR E OF TUBES, RODS, AND THE LIKE PROM BLANKS.

APPLICATION FILED JUNE 27, 1907.

Patented June 8, 1909.

4 SHEETSSHEET 2.

A. SOHWIEGER. PRESS FOR THE MANUFACTURE OF TUBES, RODS, AND THE LIKE FROM BLANKS.

APPLICATION FILED JUNE 27, 1907.

Patented June 8, 1909.

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PRESS FOR THE MANUFACTURE OF TUBES, RODS, AND THE LIKE PROM BLANKS.

APPLICATION FILED JUNE 27, 1907.

92%,QU5. Patented June 8, 1909.

, 4 SHEETS-SHEET 4.

UNITED STATES FATENT OFFICE.

ARNOLD SCHWIEGER, OF BERLIN, GERMANY.

PRESS FOR THE MANUFACTURE OF TUBES, RODS, AND THE LIIGE FROM BLANKS.

.To all wlz om it may concern:

Be it known that I, ARNOLD SCHW'IEGER, engineer, a subject of the German Emperor, and residing at No. 36 Stralauer 'Allee, Berlin, in the Kingdom of Prussia and German Em ire, have inventedcertain newand useful mprovements in Presses-for the;;Manui'acture of Tubes, Rods, and the Like from Blanks, of which the following is a specification.

This invention relates to an improved press for the manufacture of tubes, rods and the like from blanks in the form of blocks.

The improved press differs from the lmown presses of the kind in the novel construction and arrangement oftheoperativeparts as will hereinafter be described and claimed.

The improved press can .be used for a greater variety of Work, and with less expenditure of power and less wear than those hitherto in use.

A construction embodying the invention is illustrated in the annexed drawings, in

which Figure 1 is a vertical section of that portion of the press which must be shown in order to illustrate the invention. 2 is a horizontal section of the expelling device and matrix block, Fig. 3 a cross-section on the line AB of Fig. 2, and Fig. 4 an end view of the matrix block. Figs. 5 and 6 are longitudinal sections of a portion of thepress on a larger scale, and Fig. 7 shows a detail on a still larger scale. Figs. 8 to '16 are sections of tubes, and Figs. 17 to 21 illustrate a modification of the connection between the matrix-locking mechanism and the abutment for the die, Figs. 20 and 21 being sections on the'lines C -D and E-F of 19. Figs. 22 to 27 show a special form of a utment device, Fig. 26 being a section on the line G-H of Fig. 23.

The presser piston 1 is prolonged in the known manner by a die 2 traversed by a mandrel 3. The latter can be advanced independently of the die. Opposite the die is the press chamber 4,'to which is joined the matrix 5 which is held in 'position by the holder 7 mounted on the matrix block 6.

Whereas it has hitherto been usual for the press disk 8 in front of the die 2 to fit closely around, the mandrel 3, the present invention rovides an aperture which leaves an annuar chamber 9 between the inner wall and the mandrel (Figs. 5 and 6), which chamber may I Specification of Letters Patent. Application filed June 27, 1901. Serial No. 881,162.

to an extent which causes fracture.

Patentedlune 8, 1909.

be enlarged at the rear 10. The mandrel itself is slightly coned throughout its effect- We length. The diameter of the mandrel at the front end exceeds the diameter pf the aperture of the matrix, so that only a tapered portion of the mandrel, the form-point 11 (Figs. 5 to 7) can be more or lessinserted into the matrix.

On starting the pressing operation (Fig. 5) the annular space between the disk 8 and mandrel 3 allows a small quantity of the material pressed to form a sheath around the mandrel, on which the said material hardens. As the operation proceeds, that is to say as the die 2 advances in the manner shown in Fig. 6, this sheath is continuously added to, since the material tends to fill up the space 9, the capacity of which continuously increases by reason of the tapering shape of the mandrel. Injurious frictionbetween themandrel and disk and between the mandrel and material is thus obviated; in ordina presses this friction ra idly wears away t e mandrel and frequently increases The enlarged part 10 of the chamber enables the sheath surrounding the mandrel to expand and to Become loose on the rear part of the mandrel. The tapering sha e of the latter facilitates the slipping ofl of t 1e material during the pressing operation. Tensive strain on the mandrel is entirely absent by reason of the point with which the mandrel is provided. The material to be pressed is on entering the matrix compelled-to move in front of them'andrel more or less transversely to the direction of pressure (Fig. 7) and by this anegns exerts a rearward thrust on the man- The point 11 maybe of non-circular, prismatic or angulaizsection, and may be provided with longitudinal grooves ribs or projections. There may be used in connection therewith a matrix, the aperture of which corresponds at the entrance of the cross-section of the point 1 1, or is groovedor provided with rojections, according to the shape of the object to be produced. Figs. 8 to 16 show exam les of tubes, the internal contours of whlch are due to the cross-sectional shape of the point, and the external contours to the cross-section of the matrix. The thickness of the outer tube wall de ends on the more or less deep insertion of iihe point into the matrix.

To allow of ra idly and easily insertin a fresh disk8 the c amber 4 is rovided wit a mouth-pieceL (Figs. 19 and 20? consisting of a part 12 and a guide channel or inserting fun- 'nel 13. The latter may be slidable with "other parts of the press in front of the chamber 4. The disk 8 is inserted through the channel 13 and rests on the part 12 until the die 2 advances.

In order that during the pressin operation the matrix remains pressed fir against the chamber 4, it is locked in position. The 1 bolts 15 moved by hydraulically actuated pistons 14 (Figs. 2 and'3) move in guides in v the matrix block 6- at opposite sides .of the matrix holder 7. The latter may have recesses for the inserting of the bolts. In the construction shown the bolts engage behind a collar 16 of the matrix holder in the locking position, the abutment surfaces of the bolts eing wedge-shaped; the corresponding surfaces of the collar may be inc med accordingly. By this means a firm lock is obtained with comparatively slight pressure, and even if the matrix is worn re-ad uStment is unnecessary. Owing to the shortpath of the bolts between their end positions only a small quantity ofwater is required for actuating them.

- The press is also provided with an abutment device which stops the die at the end of the pressing o eration. This device conagainst the chamber 4. The parts constithe tuting the buffer must allow of a further advance of the die if the latter is used to expel the residue of the material from thepress chamber when the rear end of the latter is free. For this purpose the parts 17 may be adapted to be moved apart, and they may be posltively connected to the bolts 15 in order that the further advance of the die cannot take place until the matrix is unlocked. In

Figs. 2 and 4 the arts 17 are shown mounted onpins 19 guide in hollow arms 20 laterally projecting from the bolts 15 and suitably prevented from rotating.

Figs. 17 to 21 show another construction, in which the ring segments forming the buff er are mounted on arms 21 guided by grooves in the end wall of the press chamber and connected by means of double-armed levers 22 (Fig. 19) to the prolonged piston rods 43 of pistons 14 actuating the bolts 15. Fig.

ows the segments 17 in position to stop the die, and Fig. 19 shows them'withdrawn.

.and outlet'of fluid under pressure.

One of the arms 21 may also be connected to the part 13 through which the press disks are introduced. v 1

In the construction shown in Figs. 22 to 27 the abutments or ring segments 17 are fixed to the end wall of the press chamber, and a ring 23 rotatable on the die holder'18 carries suitable abutments 24 in the spaces between the parts 17. During the pressing o eration the parts 17 and 24 are op osite eac other, so that the advance of the is is checked and stopped at the pro or moment. When the resldue is to be ex e ed from the press chamber b means of t e die the ring 23 carrying the'a utments 24 is rotated so that the said abutments move past the parts 17. The rotation of the ring is limited by an abutment 25 fixed to the die holder and engaging an annular groove 26 in the rear surface of the ring 23. The rotation of the latter is preferably effected by means of an auxiliary cylinder 27, arranged for example on the main cylinder 28 (Fig. 22). The rod of the piston 29 working inthe cylinder 27 may be connected to a bell crank lever 30 pivoted at 33 and engaging the bifurcated end of a lever -31 fixed to the ring 23; To reduce friction the ring 23 is mounted in a ball-bearing '32.

The residue adhering to the matrix in the chamber 4 at the end of the pressing operation, and. expelled by the die in order to-be detached from the matrix b hand with the aid of a chisel, may also e mechanically removed by means of a device shown in Figs. 1 and 2. A slide, for exam le a plate 34, extending to the matrix b ock, carries a driver consisting of a divided ring, the parts 35 of which are rotatable on hinges 36 and serve to embrace a tubular prolongation 37 of the matrix holder, provided with an annular groove. Behind the ring 35 there is provided on the fixed table plate 38 a cross-place 39, into which is inserted a mandrel 40 coaxial with the matrix and with its point directed to the rear. The diameter of this mandrel is equal to that of the a erture of the matrix. The part 39 is movable, in order to givepassage for the rearward movement of the'ring 35. In the construction shown the part 39 is for this purpose hinged to the table 38 at 41 (Fig. 2).

Below the table 38 a tube 43 surrounded by a cylinder 44 is supported by bearings 42. The ends of the cylinder 44 are closed except for the passage of the tube, and the latter is provided with cocks 45 and 46 for the inlet At its central part the tube carries a piston 49 which makes a tight joint with the mner surface of the cylinder and divides the interior of the latter into two chambers 47 and 48. At each side of the piston the tube 43 has a ertu'res 50; Projections 52 integral with te cylinder extend through a slot 51 in the table and support a plate 34 (Fig. 1). When the advance of the matrix and the pressed tube or the like is to take place, and the plate 34 has for that purpose been moved into the position shown in Fig. 1, the driver 35 is closed and the cross bar 39 turned back (Fig;

2). The water under pressure is admitted to the tube 43 .at'45", and enters the chamber 47 The mandrel 40 is thus caused to expel the" residue of material from the matrix. Thereupon the plate 34 is moved-back to expose the mandrel 40 and-the part 39'is turned back to expose the entrance to the matrix. Water is again adm'itted at 46 to move the matrix back into the ress, in which it is locked by means of the bolts 15-for the next pressing operation.

What I claim as my invention and 'desire to secure by United'States Letters Patent 1s:

1. In a press of the character described, the combination with the press cylinder terminating in a matrix, of a plungerterminating in a perforate press disk and adapted to operate in the presscylinder, and a mandrel projecting through the lungerand the disk 1n spaced relation to t e ration in the disk, I p y 2. In a press of the character described, the combination with the press cylinderterminating in amatrix, of a lun er terminating in a perforate press an adapted to operate 1n the press cylinder, and a mandrel projecting through the plunfier and the disk 1n spaced relation to the wa tion in the disk,.the perforation in the disk being enlarged at the rear. 4

3. In a press of the character described, the combination with-the press cylinder terminating in a-matrix, of a plun er terminating in a perforate press dis an adapted to operate in the press cylinder, and a mandrel projecting through the plun er and the disk in spaced relation to the wa tionin the disk; said mandrel being mounted to move in the plunger'and of gradually increasing diameter from the front to the rear.

4. In a press of the character described,

jder,

wall of the perfoof the perforaof the perforathe combination with the (press cylinder, of a.

matrix arranged at one en of the press cylina holder for said matrix having a reduced cylindrical portion intermediate of its ends, a blockin which the matrix holder is movably mounted and having guides and bolts mounted to move in said guides and having semi-cylindrical end faces adapted to engage the reducedportio'nof the'ho .lock the holder in position.

der to 5. In a press of the character described, V

the combination of a press cylinder, a lunger adapted to operate in the press cyhn er, and

a mouth-piece on the cylinder having a channel for the insertion-of a suitable press disk on the plunger.

6. In a press 'of the character described, the combination with the press cylinder and the'plunger adapted to operate therein, of a bufier mounted directly in front of the press cylinder. and adapted to arrest the advance of the plunger in the cylinder, andmeans for Withdrawing said buffer to permit advance of the plunger;

7 In a press of the character described, the combination with the press cylinder and the plunger adapted to operate therein, of a buffer consisting 'of a plurality of movable ring segments mounted in front of the CyllD-;

der and ada ted to arrest the advance of the plunger in tlie cylinder.

8. In a press of the character the combination with the press cylinder terminating in a matrix and the 'lunger adapted 'to operate in the cylinder, 0 means-for lock- 1 ing the matrix in position in the cyhnder,

means'for withdrawing said locking means, a

buffer mounted to arrest the advance of the plunger in the cylinder, and a. connectlon etween said locking means and said plunger whereby the locking means.

9. In a press of the character described, the combination with the press cylinder and the matrix mounted at one endiof the cyhndescribed,

plunger is withdrawn with the der, of means for withdrawing the matrix from the cylinder, and a mandrel adapted to be moved into the path of the matrix to expel residue from the matrix.

The foregoing specification signed at Berlin, Germany, this seventh day of-June, 1907.

ARNOLD SCHWIEGER. 

